Electromagnetism and Solenoids

• What happens when a current flows in conducting wire?

  A magnetic field is produced around the wire
• What can be found with the Right hand grip method?

  The direction of the current and the direction of the magnetic field lines

  
• What 3 factors increase the strength of a magnetic field?

  Increasing the size of the current, Increasing the number of coils and inserting a soft iron core into a solenoid
• What is a solenoid?

  A wire looped into a spiral shaped coil

  
• What is an electromagnet?

  An iron core inserted into a solenoid
• How does the solenoid in this image increase the strength of the magnetic field?

  By turning on the current, the shape of the solenoid creates a strong and uniform magnetic field inside the solenoid

  
• Explain how using the Right Hand Grip Method can help you find the north pole of this solenoid?

  1. Hold the solenoid in your right hand and follow the direction of the current with your fingers
  2. Your thumb will point to the solenoid's north pole

  
• Explain how a solenoid increases the magnetic field strength?

  It concentrates a longer piece of wire into a smaller area . And the looped shape means that the magnetic field lines around the wire are all in the same direction
• True or False : The magnetic field around a solenoid has a similar shape to that around a bar magnet

  True